Energy-saving permanent magnet synchronous motor cooled by liquid

Abstract

The invention discloses an energy-saving permanent magnet synchronous motor cooled through liquid, and relates to the field of permanent magnet synchronous motor application, the energy-saving permanent magnet synchronous motor comprises a machine base, the end part of the machine base is provided with a first mounting groove and a second mounting groove which are provided with a cooling structure, the cooling structure comprises two groups of cooling assemblies, and each cooling assembly comprises a circular ring body; a through groove is formed in the end of the circular ring body in a penetrating mode, the first notches and the second notches are communicated to form a wave-shaped cooling channel, multiple sets of blocking soldering lugs are arranged at the end, provided with the multiple sets of first notches, of the circular ring body, and a blocking ring is movably installed at the other end of the circular ring body. The assembly type cooling structure is arranged to replace a traditional integrated cooling channel, the cooling structure can be disassembled and comprehensively washed, later maintenance of the cooling structure is more convenient, the axial distance of the cooling channel is short, the end face of the cooling channel is detachable, the whole cooling channel is changed into multiple sets of open cooling grooves, high-pressure water flow can conduct fixed-point washing, and the cleaning effect is improved.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet synchronous motor applications, specifically an energy-saving permanent magnet synchronous motor cooled by liquid. Background Technology

[0002] Liquid-cooled permanent magnet synchronous motors are high-efficiency power devices that combine permanent magnet synchronous motors with liquid cooling systems. The core technology is to use circulating coolant to replace or assist traditional air cooling, thereby achieving efficient heat dissipation from the motor. This breaks through the power density bottleneck of ordinary permanent magnet synchronous motors and achieves energy saving and emission reduction, making it suitable for high-load and high-power applications.

[0003] A permanent magnet synchronous motor mainly consists of a frame housing, inside which are the stator and rotor assemblies. End caps at both ends provide limiting mounting. Typically, mounting boxes are also provided on the sides of the frame housing for mounting the motor's encoder, sensors, and transformer. The cooling system of a liquid-cooled permanent magnet synchronous motor is a closed-loop temperature control system. Its core logic is to precisely remove heat from the motor's heat source through the directional flow of coolant, and intelligently switch the circulation mode according to the motor's operating conditions, balancing cold start warm-up and high-temperature heat dissipation needs. The entire cooling system is a closed loop; the coolant (water-glycol mixture, cooling oil, etc.) circulates within the loop and does not directly contact the outside air (avoiding contamination and evaporation losses). The system is powered by a coolant circulation pump, and the heat is ultimately dissipated into the environment through a radiator / heat exchanger.

[0004] The cooling efficiency of a liquid cooling system depends not only on the coolant circulation rate but also on the distribution of the cooling channels. The mainstream distribution types of cooling channels include axial zigzag and spiral types. However, these types typically only have one set of coolant inlets and one set of coolant outlets. This results in the coolant entering the chassis housing at a lower temperature and exiting at a higher temperature. Therefore, regardless of the type of cooling channel, although the coolant carries away some heat from the chassis housing, it will still experience uneven axial or radial temperature distribution, leading to a persistent state of uneven temperature distribution. Under these conditions, the motor's internal structure is not only affected, but the coolant is also blocked. The motor's stable operating temperature can reach 90-150℃, while the coolant will be maintained at 60-120℃. The commonly used water glycol has a boiling point of about 108℃. Especially under short-term overload, the coolant generates local high temperature during circulation. The coolant boils and produces a large number of bubbles, which will block the flow channel, reduce heat exchange efficiency, and cause local overheating of the motor. In addition, the coolant in the high-temperature area is prone to failure, and calcium and magnesium ions precipitate to form scale. The temperature difference between hot and cold areas will cause electrochemical corrosion, and the resulting rust will block the flow channel. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an energy-saving permanent magnet synchronous motor cooled by liquid to solve the technical problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving permanent magnet synchronous motor cooled by liquid, comprising a frame, wherein a stator assembly and a rotor assembly are disposed inside the frame, the end of the frame is divided into an inner shell and an outer shell by opening a first mounting groove and a second mounting groove, and a mounting box is disposed on the side of the frame, wherein a cooling structure is movably installed inside the first mounting groove and the second mounting groove, and the cooling structure is connected to a coolant circulation system; The cooling structure includes two sets of cooling components. Each cooling component includes a ring body with multiple through slots at one end and multiple first notches at the other end. The through slots, first notches, and second notches are connected to form a wave-shaped cooling channel. An inlet pipe and an outlet pipe are provided on the side of the ring body. The inlet pipe has a square head, and the outlet pipe has a round head. Multiple sealing plates are provided at the end of the ring body with multiple first notches, and a sealing ring is movably installed at the other end of the ring body. The wave-shaped cooling channels of the two sets of cooling components are interlocked and distributed, and the coolant flows in opposite directions in the two sets of cooling components.

[0007] By adopting the above technical solution, a modular cooling structure is set up to replace the traditional integrated cooling channel. The cooling structure can be disassembled and thoroughly cleaned, making the later maintenance of the cooling structure more convenient. Compared with the base shell of the integrated cooling channel structure, which relies on high-pressure water flow to flush the cooling channel when cleaning blockages, and whose cooling channel is long and has a large distribution range, it is not thorough in cleaning the dead corners of the cooling channel. In this application, multiple sets of cooling structures are used in combination, the axial distance of a single cooling channel is short, and the end face can be disassembled, so that the overall cooling channel becomes multiple sets of open cooling tanks. Thus, high-pressure water flow can be used to flush the points, improving the cleaning effect. When the cooling channel is completely corroded and blocked, the modular cooling mechanism can be replaced individually, reducing the later maintenance cost of the equipment, rather than directly replacing the entire base shell.

[0008] The present invention is further configured such that limit blocks are provided on both the inner and outer sides of the annulus, and multiple sets of fitting grooves matching the limit blocks are opened on the inner sides of the first and second mounting grooves of the base.

[0009] Preferably, by setting limiting blocks and fitting grooves, the cooling structure is installed more stably, and thermal grease can be applied to the mounting surface during installation to reduce the generation of air heat conduction paths and improve the overall heat exchange efficiency.

[0010] The present invention is further configured such that a front end cover is provided at one end of the base and a rear end cover is provided at the other end of the base, the front end cover and the rear end cover being used to limit the installation of the stator assembly and the rotor assembly.

[0011] The present invention is further configured such that a front fixing ring is provided at one end of the base for sealing the first mounting groove, and a rear fixing ring is provided at the other end of the base for sealing the second mounting groove.

[0012] Preferably, a front fixing ring and a rear fixing ring are provided to fix the cooling structure in the first mounting groove and the second mounting groove.

[0013] The present invention is further configured such that the multiple sets of sealing welding pieces and the annulus are fixedly connected by welding and polishing processes.

[0014] Preferably, by employing welding and polishing processes, the end of the annulus located in the first notch is directly blocked by sealing welding pieces, which can form a wave-shaped cooling channel with multiple sets of through grooves.

[0015] The present invention is further configured such that the sealing ring and the annular body are installed by means of multiple sets of screws, and an annular sealing gasket is provided between the sealing ring and the annular body.

[0016] Preferably, by setting a removable sealing ring, when the sealing ring is removed, the waveform cooling channel is re-split into multiple sets of through grooves, so that high-pressure water can be used for point-to-point flushing, thereby improving the cleaning effect.

[0017] The present invention is further configured such that the cooling structure in the first mounting groove is annular and the cooling structure in the second mounting groove is C-shaped.

[0018] Preferably, by setting cooling structures of different shapes, the irregular structure of the base can be adapted, especially the C-shaped cooling structure can avoid the mounting box.

[0019] The present invention is further configured such that the coolant circulation system includes a coolant delivery pipe, a radiator, a reservoir, a circulation pump, and a thermostat.

[0020] Preferably, a coolant circulation system can be installed to allow the coolant to flow and dissipate heat from the motor.

[0021] In summary, the present invention has the following main beneficial effects: 1. This invention replaces the traditional integrated cooling channel with a modular cooling structure, allowing for complete disassembly and cleaning of the cooling structure. This makes subsequent maintenance of the cooling structure more convenient. Compared to the integrated cooling channel structure, which relies on high-pressure water flow to clean blockages within the cooling channel, and which has a long and wide distribution range, making it difficult to thoroughly clean dead corners, this invention uses multiple sets of cooling structures stacked together. The axial distance of each cooling channel is short, and the end faces are detachable, turning the entire cooling channel into multiple open cooling troughs. This allows for targeted cleaning with high-pressure water flow, improving the cleaning effect. When the cooling channel is completely corroded and blocked, the modular cooling mechanism can be replaced individually, reducing the subsequent maintenance costs of the equipment, rather than directly replacing the entire machine base.

[0022] 2. This invention uses two sets of cooling components with opposite coolant flow directions in parallel, which allows the coolant in the two sets of cooling channels to cool each other. The two sets of cooling channels in the same cooling structure are staggered and interlocked, which shortens the heat exchange path of the coolant in the two sets of cooling channels, makes the coolant temperature distribution more uniform, and thus makes the overall heat dissipation of the motor more uniform, reduces the occurrence of local high temperature of coolant, and can also improve the coolant blockage. Traditional single inlet and outlet cooling channels have low coolant inlet temperature and high coolant outlet temperature, which are prone to blockage at the outlet end, and also affect the temperature difference on different sides of the machine base shell. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a demonstration diagram showing the installation of the base, front retaining ring, and rear retaining ring in this invention. Figure 3 This is a diagram illustrating the installation of the base and cooling structure in this invention. Figure 4 This is a schematic diagram of the base structure in this invention; Figure 5 This is a schematic diagram of the mounting box distribution in this invention; Figure 6 This is a schematic diagram of the fitting and assembly of two sets of cooling components in the cooling structure of the present invention; Figure 7 This is a schematic diagram showing the connection between the annular body, sealing plate, and sealing ring of the cooling component in this invention; Figure 8 This is a schematic diagram of the original blank of the annulus in this invention before it is grooved; Figure 9 This is a schematic diagram of the processing distribution of the through-groove in this invention; Figure 10 This is a schematic diagram of the first notch processing distribution in this invention; Figure 11 This is a schematic diagram of the second notch processing distribution in the present invention; Figure 12 This is a schematic diagram of the waveform cooling channel distribution in this invention; Figure 13 This is a schematic diagram of the interlocking distribution of two sets of waveform cooling channels in the cooling structure of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1. Base; 101. First mounting slot; 102. Second mounting slot; 103. Inner shell; 104. Outer shell; 105. Mounting box; 2. Fitting slot; 3. Front cover; 4. Rear cover; 5. Cooling assembly; 501. Ring; 502. Limiting block; 503. Through slot; 504. First notch; 505. Second notch; 506. Water inlet pipe; 507. Water outlet pipe; 508. Sealing welding piece; 509. Sealing ring; 6. Front fixing ring; 7. Rear fixing ring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The embodiments of the present invention will now be described.

[0027] An energy-saving permanent magnet synchronous motor cooled by liquid, please refer to 1- Figure 13 The device includes a base 1, which contains a stator assembly and a rotor assembly. The end of the base 1 is divided into an inner shell 103 and an outer shell 104 by opening a first mounting groove 101 and a second mounting groove 102. Both the first mounting groove 101 and the second mounting groove 102 can be manufactured by turning. The side of the base 1 is provided with a mounting box 105, which is used to install encoders, transformers and sensors, etc. The specific installation is different depending on the type of motor. Cooling structures are movably installed inside the first mounting groove 101 and the second mounting groove 102, and the cooling structures are connected to a coolant circulation system. The cooling structure includes two sets of cooling components 5. Each cooling component 5 includes an annular body 501. Multiple through slots 503 are formed at the ends of the annular body 501. Multiple first notches 504 are formed at one end of the annular body 501, and multiple second notches 505 are formed at the other end. The through slots 503, first notches 504, and second notches 505 are connected to form a wave-shaped cooling channel. The through slots 503, first notches 504, and second notches 505 can all be manufactured using turning processes. The side of 1 is provided with an inlet pipe 506 and an outlet pipe 507. The inlet pipe 506 and the outlet pipe 507 can be manufactured by welding and drilling. The inlet pipe 506 has a square head and the outlet pipe 507 has a round head. Multiple sets of sealing welding pieces 508 are provided at one end of the annular body 501 with multiple sets of first notches 504. A sealing ring 509 is movably installed at the other end of the annular body 501. The wave-shaped cooling channels of the two sets of cooling components 5 of the cooling structure are interlocked and distributed, and the coolant in the two sets of cooling components 5 flows in opposite directions.

[0028] Please see Figure 3 , Figure 4 and Figure 8 Limiting blocks 502 are provided on both the inner and outer sides of the annular body 501. Multiple sets of fitting grooves 2 matching the limiting blocks 502 are opened on the inner side of the first mounting groove 101 and the second mounting groove 102 of the base 1. By setting the limiting blocks 502 and the fitting grooves 2, the cooling structure is installed more stably. Thermal grease can be applied to the mounting surface during installation to reduce the generation of air heat conduction paths and improve the overall heat exchange efficiency.

[0029] Please see Figure 1 The base 1 has a front cover 3 at one end and a rear cover 4 at the other end. The front cover 3 and the rear cover 4 are used to limit the installation of the stator assembly and the rotor assembly.

[0030] Please see Figure 2 and Figure 3 One end of the base 1 is provided with a front fixing ring 6 for sealing the first mounting groove 101, and the other end of the base 1 is provided with a rear fixing ring 7 for sealing the second mounting groove 102. By providing the front fixing ring 6 and the rear fixing ring 7, the cooling structure in the first mounting groove 101 and the second mounting groove 102 is fixed.

[0031] Please see Figure 7 Multiple sets of sealing welding pieces 508 and the annular body 501 are fixedly connected by welding and polishing processes. By using welding and polishing processes, the sealing welding pieces 508 directly block one end of the annular body 501 in the first notch 504, which can form a wave-shaped cooling channel with multiple sets of through grooves 503.

[0032] Please see Figure 7The sealing ring 509 and the annular body 501 are installed by setting multiple sets of screws, and an annular sealing gasket is set between the sealing ring 509 and the annular body 501. By setting a removable sealing ring 509, when the sealing ring 509 is removed, the waveform cooling channel is re-split into multiple sets of through grooves 503, so that high-pressure water can be used for point-to-point flushing to improve the cleaning effect.

[0033] Please see Figure 3 The cooling structure in the first mounting slot 101 is annular, and the cooling structure in the second mounting slot 102 is C-shaped. By setting different shapes of cooling structures, the irregular structure of the base 1 can be adapted. In particular, the C-shaped cooling structure can avoid the mounting box 105.

[0034] Please see Figure 1 The coolant circulation system includes coolant delivery pipes, radiator, reservoir, circulation pump, and thermostat. By setting up the coolant circulation system, the coolant can flow to dissipate heat from the motor.

[0035] The working principle of this invention is as follows: When the permanent magnet motor is cold-started, the coolant temperature is low, below the thermostat opening threshold, typically 80-90°C. At this time, the thermostat valve is closed, and the coolant does not flow through the external radiator but instead flows directly back to the circulation pump inlet through the bypass pipe, forming a small loop of "motor-pump-bypass pipe". At this time, only one of the two cooling components 5 in each cooling structure is activated, which not only adapts to the initial start-up stage but also reduces the power consumption of the cooling system. When the coolant temperature rises to the thermostat opening threshold, the valve gradually opens, and the high-temperature coolant is diverted into the radiator for heat dissipation. The higher the temperature, the larger the valve opening, and the higher the proportion of coolant flowing through the radiator, ensuring that the motor temperature remains stable within the optimal operating range. If the temperature continues to rise, the thermostat valve fully opens, and all coolant flows through the radiator, working in conjunction with the fan / chiller unit to achieve maximum heat dissipation capacity.

[0036] Specifically, for the same set of cooling structures, the coolant enters through the inlet pipe 506, flows in the corrugated cooling channel, and then exits through the outlet pipe 507. Multiple sets of cooling structures are connected in parallel to the cooling system, and the coolant flows in opposite directions in the two sets of cooling components 5 of the cooling structure. That is, the coolant flows radially from two directions. The temperature difference in the two sets of corrugated cooling channels compensates for each other, so that the temperature distribution is uniform and the frame 1 is cooled at the same time. This makes the temperature distribution on the radial outer side of the frame 1 more uniform, further improving the cooling effect on the frame 1, stabilizing the motor operating conditions, and achieving the purpose of motor energy saving.

[0037] With prolonged use of the cooling system, coolant may accumulate and become clogged. To resolve this, the cooling system can be shut down, and multiple sets of cooling structures can be removed by disassembling the front retaining ring 6 and the rear retaining ring 7. Then, the sealing rings 509 can be removed from both ends of the cooling structure. High-pressure flushing of the inside of the annular body 501 with running water can effectively remove the deposits in the wave-shaped cooling channel and restore the flow of the cooling structure.

[0038] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An energy-saving permanent magnet synchronous motor cooled by liquid, comprising a frame (1), wherein a stator assembly and a rotor assembly are disposed inside the frame (1), characterized in that: The base (1) is divided into an inner shell (103) and an outer shell (104) by opening a first mounting groove (101) and a second mounting groove (102) at the end. A mounting box (105) is provided on the side of the base (1). Cooling structures are movably installed inside the first mounting groove (101) and the second mounting groove (102). The cooling structures are connected to a coolant circulation system. The cooling structure includes two sets of cooling components (5). Each cooling component (5) includes an annular body (501). Multiple through slots (503) are formed through the ends of the annular body (501). Multiple first notches (504) are formed at one end of the annular body (501), and multiple second notches (505) are formed at the other end of the annular body (501). The through slots (503), first notches (504), and second notches (505) are connected to form a wave-shaped cooling channel. The side is provided with an inlet pipe (506) and an outlet pipe (507). The inlet pipe (506) has a square head and the outlet pipe (507) has a round head. Multiple sets of sealing welding pieces (508) are provided at one end of the annular body (501) with multiple sets of first notches (504). A sealing ring (509) is movably installed at the other end of the annular body (501). The wave-shaped cooling channels of the two sets of cooling components (5) of the cooling structure are interlocked and distributed, and the coolant in the two sets of cooling components (5) flows in opposite directions.

2. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: Limiting blocks (502) are provided on both the inner and outer sides of the annulus (501), and multiple sets of fitting grooves (2) matching the limiting blocks (502) are opened on the inner sides of the first mounting groove (101) and the second mounting groove (102) of the base (1).

3. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: The base (1) is provided with a front cover (3) at one end and a rear cover (4) at the other end. The front cover (3) and the rear cover (4) are used to limit the installation of the stator assembly and the rotor assembly.

4. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: One end of the base (1) is provided with a front fixing ring (6) for sealing the first mounting groove (101), and the other end of the base (1) is provided with a rear fixing ring (7) for sealing the second mounting groove (102).

5. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: The multiple sets of sealing welding pieces (508) and the annular body (501) are fixedly connected by welding and polishing processes.

6. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: The sealing ring (509) and the annular body (501) are installed by setting multiple sets of screws, and an annular sealing gasket is provided between the sealing ring (509) and the annular body (501).

7. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: The cooling structure in the first mounting slot (101) is annular, and the cooling structure in the second mounting slot (102) is C-shaped.

8. The energy-saving permanent magnet synchronous motor cooled by liquid according to claim 1, characterized in that: The coolant circulation system includes coolant delivery pipes, radiators, reservoirs, circulation pumps, and thermostats.

Images